Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d6fe97f63a46ea…

MALICIOUS

PDF

51.1 KB Created: 2020-10-15 21:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: d942cec5fbb6893e66b39d7aca69b091 SHA-1: c738689191c99f78c9b2d0d2c2c134c110a53c67 SHA-256: 78d6fe97f63a46eaf15b573faa60adfe8bd62c044e3b5392dd1d7c6fc5833fc4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, with one identified as a malicious redirector. The document appears to be part of a link farm, likely intended for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/123?keyword=my+first+90+days+pdf In PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/8767144.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/ad9d4.pdfIn PDF document text
    • https://site-1042602.mozfiles.com/files/1042602/download_kinemaster_mod_apk_4_10.pdfIn PDF document text
    • https://site-1040286.mozfiles.com/files/1040286/kemenotaxagezozoreruzogur.pdfIn PDF document text
    • https://site-1039436.mozfiles.com/files/1039436/detepufobejirukarux.pdfIn PDF document text
    • https://site-1037279.mozfiles.com/files/1037279/12639399379.pdfIn PDF document text
    • https://site-1042551.mozfiles.com/files/1042551/morupinulufabutosufux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0494/0464/1436/files/fundamentals_of_project_sustainability.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/8611/9580/files/rigasoso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3116/7137/files/catoosa_county_tag_office_ringgold_ga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c50a4324-cd87-4864-ace7-a198cde6c30f/74807777722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b244c44-5019-4918-b3d5-3185aebb5e0f/33844653404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/564e6646-14f6-4ece-8bd2-518dfea2e939/novarekezoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4931f4f-73dc-467b-83d5-d904df8a2c90/legironivoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6bf55e-c3ee-43f4-9063-5d4d3582d4c1/75660875948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ab5e20-51d4-47f2-af85-81b028174238/54254463921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53baef93-4998-4479-85ea-52a4f14e277f/43477590691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19fb7128-0e36-40d4-aa08-6c7d185982fe/46710787838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98494819-accf-4857-9316-aa22435b4152/wajujomewikufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c86ffdaf-a8ba-42e4-9f64-41b5883817b5/16042592663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b7429bd-46e3-48bc-baa5-75c7120703d6/xogoxemetozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7aeb781-0466-49bc-80ed-5c89ee20fdc7/40052993200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da26de42-95f4-4907-b4e0-a748c70ac1c3/rabevot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22758dbe-46ff-45d9-8de5-92b8e3a39970/93850132516.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C09 4864 bytes
SHA-256: 47ee0a648f8435fbec0702e24040f8c1a7ab173504fc6f650f6a1a4a70361e51
font_01_sfnt_off00008c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C94 10492 bytes
SHA-256: 09f6d85dd6178568c2ec0904d6d50ada5bb6aa98568261eff5cc1441be20c865
font_02_sfnt_off0000b03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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